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Mine is a 77 and run 87oct in mine, when in Colorado I can find 85. I don't let them sit with out marine type Stabil in it's tank of more than a few days and have had zero issues even after it sat for 6 months. I think your worrying too much just RTS.
 

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I ride a '78 Suzuki GS1000E. I run the cheapest low octane fuel I can find and it is usually E10. Not the slightest problem. Sta-Bil destroyed the tank on my parts bike (a lot of it became a solid). I guess when it was parked the tank was full. I use Star Tron. It is considered a fuel and can not harm the bike. My bike was parked for almost two years after my knee replacement in a metal building with some fuel in the tank. The only problem was the petcock diaphragm O-ring got stuck. Freed it up and greased it with dielectric grease so it moved freely and she started right up. Most of the boat guys down here use Star Tron and they abuse their fuel more than most.
Never heard of this ever, prior to you. Which Sta-bil did this happen with and did you put it in the tank? Or did someone else say thy placed it in the tank?
 

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Sta-bil is only good for a supposed year. I used it for 2 years to store my car and my bike when I went to Korea. No problems, but I could tell the gas was very soured. If he put it in there and it sat for years well there is limits to how much protection sta-bil can do.

A lot of people use transmission fluid in conjunction with sta-bil due to the properties of the oil and it coats things and helps prevent the ethanol from getting that crusty white residual stuff on the aluminum surfaces since leaded fuel had gone away. (sorry not familiar with this procedure or what it actually does)
 

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What about for a week? Lets say we're just letting the bike sit with a full tank of E10 for a week in the garage, without any additives. Theoretically might some gunk/buildup occur VS if it was used up over the next 24 hrs?
This conversation is certainly making me want to order up some Star Tron and keep it under the seat.
I keep Marine Sta-bil with me in my tank bag. I usually don't add it unless it is my final ride for the week. Normally I would not sweat a week however sometime good intentions melt away in a snow storm or monsoon season or for whatever reason will keep me from riding very long. Making it a habit on these old bike will definitely keep you from wondering "did I add it last time".

Using Star-tron or Sta-bil or what ever is designed to help "preserve" the gas is a good idea. Me when I ride it is usually at least 400 or 500 miles thus why I only add it on my final fill up for the week.
 
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